To use Clean Widgets once you've bought them:
On Gingerbread and below, touch-and-hold on your homescreen and select "Widgets". Find the widget you'd like and touch to select it.On Honeycomb/Ice Cream Sandwich and above, open the app drawer and press the "Widgets" button. Find the widget you'd like, touch-and-hold, and drag the widget to where you'd like it on your homescreen.
If you are running Android 4.2 or higher, the Clean Clock widget can be added as a lock screen widget!
Clean Widgets is updated often, and if you already own Clean Widgets these updates are free of charge. Please take the time to rate and review, your input is read and valued!
Screenshots Clean Widgets:
Video Clean Widgets